Little, if anything, of Javitz' past has been revealed, but in The Uncanny X-Men #300 he says he's been watching the X-Men pursue their cause for "years" before throwing himself in the fray. Of all the X-Men, he seems particularly contemptful of Cyclops, whom he tries to kill in the same issue.
How he lost his right eye has never been revealed. The mutant died when Holocaust attacked Avalon, the homebase of the Acolytes, in X-Men v2 #43.